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Last active May 31, 2017
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Rank some elements by ascending date
# coding: utf-8
"""rank by ascending date
from datetime import date
from faker import Factory
import pandas as pd
import numpy as np
FAKE = Factory().create()
def fake_id(number):
f = lambda : FAKE.lexify('???').lower() + FAKE.numerify('#')
possible = [f() for _ in range(number // 10)]
return np.random.choice(possible, size=number).tolist()
def fake_date(number):
f = lambda: FAKE.date_time_this_decade().date()
return [f() for _ in range(number)]
def count_demande(df, idx, date):
return len(df[(df.idx == idx) & ( < date)])
if __name__ == '__main__':
nrows = 100
df = pd.DataFrame({"idx": fake_id(nrows),
"date": fake_date(nrows)})
df = df.reindex_axis(['idx', 'date'], axis=1)
df['date'] = df['date'].apply(pd.Timestamp)
df['nb_demande'] = df.apply(lambda row: count_demande(df, row.idx,, axis=1)
# or
df['nb_demande_bis'] = df.groupby('idx')['date'].rank()
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